Portable asphalt plant.



PATBNTED JUNE so, 1908.

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P. B. SMITH. PORTABLE ASPHALT PLANT.

APPLICATION FILED MAB..27'.1906- WITNESSES:.

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No. 892,320. PATENTED JUNE 30,1908.

F. B. SMITH. PORTABLE ASPHALT PLANT..

APPLIOA'IION IILED MAE.Z'7.1906.

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UNITED sTATEs PATENT oEEioE.

FRANK B. SMITH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE BARBERASPHALT PAVING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFWEST VIRGIN IA.

To all whom it may concern:

Be it known that I, FRANK B. SMITH, of Philadelphia, in the State ofPennsylvania,- have invented certain new and useful Improvements inPortable Asphalt Plants, whereof the following is a specification,reference being had to the accompanying drawm 's.

It is important that portable asphalt plants should be fitted withhoisting apparatus whichis used for various purposes, as for instance,for hoisting the asphalt in order that it may be deposited into theasphalt tank with which the apparatus is provided. These portableasphalt plants have hitherto been provided with various forms of primemovers such as steam engines, gasolene engines, etc. and have also beenprovided with air compressors employed for delivering compressed air tothe asphalt tanks, but no method has heretofore been devised whereby thecompressed air with which they are pro vided may be utilized for thehoisting device. Instead thereof recourse has been had to the slower andmore cumbersome methods of hoisting, as for instance, winches run by theprime mover. I have devised means whereby an air hoist can beincorporated as an integral part of one of these plants, and operated byair from the compressor, and have found that 'very marked advantagesresult from this device.

In the accompanying drawings, Figure 1, represents a longitudinalelevation, and, Fig. II, a partial plan view of a plant embodying myinvention.

The plant is mounted upon a platform car 1, which carries the asphalttank 2, mounted on one end thereof, and the sand driers 3, mounted onthe other end. Between these are placed the sand hoist 4, and the mixer5. All of these parts are of a construction previously described by mein prior patents or applications and need not be further described.

The car carries a prime mover 10, which as shown in Fig. II, consists ofa small gasolene motor, which I have found a most convenientarrangement. The shaft 11, of the m0- tor is connected by the gears 12,13, with an air compressor 14, which is used for various purposes inconnection with the plant, and from which according to my presentinvention, I obtain the supply of compressed air required to operate thehoist which I will Specification of Letters Patent.

Application filed March 27, 1906.

PORTABLE ASPHALT PLANT.

Patented June 30, 1908.

Serial No. 308,258.

now describe. This hoist consists of a cylinder 15, which is mountedlongitudinally be neath the platform of the car. It is convenientlysecured to the frames 16, which support the car platform. The piston 17,of the cylinder carries sheaves 18, on its protruding extremity. Othersheaves 19, are suitably journaled near the other end of the cylinder.The hoisting cable 23, is anchored at 20, and after making one or moreturns around the pairs of sheaves 18, and 19, is led around sheaves 21,and 22, which are in suitable relation to the hoisting derrick. Thisderrick may preferably be constructed of iron tubing as shown in thedrawings, and comprises an upright 30, which is supported for rotationin suitable bearings 31, 31, which are secured to the side of theasphalt tank and is provided with collars 32, 32, resting on saidbearings; to the upper end of the upright is attached the arm 33, theprojecting end of which is additionally supported by the brace 34. Thearm 33, of the derrick may thus be swung over different parts of thetank.

Small pulleys 35, 35, are journaled in the arm 33, and afford thenecessary support for the hoisting cable of the derrick, the arrangementof which is otherwise clearly shown in the drawings.

Although I have shown the derrick on the side of the car immediatelyadjoining the asphalt tank, it will be understood that it may be placedelsewhere on the car, or if desired, two or more derricks may be mountedin different parts of the car, and by suitable arrangement of sheaves,the hoisting rope may be led to any of such derricks.

The compressed air for the operation of the hoist is led by the pipe 40,from the air compressor to the cylinder 15, of the air hoist. Theoperation of said cylinder is controlled by the hand valve 41.

By means of the combination as above described, I obtain a veryquick-operating hoisting apparatus, and am enabled to mount it on a partof the car where it calls for no increase in the size of the car. Theproblem in 1plants of this description, is to compress a of the requiredparts for the plant within the comparatively small space provided by asingle platform car. Floor space is therefore very valuable, and it isone great advantage of my invention that I am able to provide the plantwith this eilicacious form of hoisting apparatus without employing anyof the floor space, for the derrick being formedof tubing may be mountedon the side of the car, and the air hoist, as above described, ismounted entirely beneath the car body, so that its longitudinal thrusttakes place in a plane where there is nothing to interfere with itsoperation.

Having thus described claim In a portable asphalt plant, a single carbody, an air compressor and its operating means mounted on said carbody; a cylinder and piston mounted beneath the car body; connectionswhereby the piston is operated my invention, I

by air from the compressor; a derrick mount ed on the car body; asheaveon the end of the. piston, other sheaves fixed to the car body and ahoisting cable which after passing around the piston sheave is led overother sheaves to the extremity of the derrick, substantially asdescribed.

In testimony whereof, I have hereunto signed my name, at Philadelphia inthe State of Pennsylvania this 26th day of March 1906.

FRANK B. SMITH.

Witnesses:

FREDERICK A. HOLMES, JAMES H. BELL.

